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Centre for Plant & Water Science 2008 Annual Report OXYGATION OF SUB-SURFACE DRIP IRRIGATED PINEAPPLE, COTTON AND WHEAT SUMMARY Wheat followed a cotton crop in two soil types in concrete tubs, and itself was followed by a subsequent cotton crop. The effects of oxygation on the wheat suggest an increase in biomass which was associated with an increase in the leaf chlorophyll content, more ears per unit area, and reduced canopy temperature. A large-scale replicated trial on an existing pineapple crop in Yeppoon compared oxygation with no oxygation, both with subsurface drip irrigation. Total yield, but not marketable yield, was increased with oxygation, and some fruit quality parameters were also better with oxygation. Following on from the 2007/8 cotton crop (see Annual Report 2007) a wheat crop was planted, using two methods for aerating the irrigation water (Mazzei and Seair). The wheat crop was harvested before grain maturity to allow for planting of the subsequent cotton crop with the GM planting window. There was a significantly higher leaf chlorophyll concentration for Mazzei followed by Seair and control (Table 1). The number of wheat ears, leaf dry weight and total dry matter were significantly greater on the vertisol whereas chlorophyll content was greater on the ferrosol. Table 1. Effect of different oxygation methods and soil types of growth parameters and yield components of wheat Treatments Oxygation Soil type Levels WUEi Leaf Leaf Number (mol Weight of dry chlorophyll water of CWSI 1 CO matter (g m -2 ) 2 concentration potential Ears / mmol (SPAD units) (-kPa) (m 2 ) H 2 O) Ear Leaf Stem Control 37.1 1000 0.22 5.96 329.4 260.0 136.1 308.9 Mazzei 41.0 1040 0.18 6.54 357.1 289.2 160.2 313.2 Seair 38.9 1130 0.18 5.96 337.5 271.0 132.1 322.4 LSD (10 df) 2 2.3 197 0.10 0.94 57.5 58.2 38.7 69.0 Vertisol 37.5 1090 0.21 6.36 383.4 328.5 194.3 382.5 Ferrosol 40.9 1040 0.17 5.99 302.2 221.6 93.0 248.6 LSD (10 df) 1.8 158 0.08 0.75 46.2 46.7 31.1 55.4 1 Crop water stress index; 2 LSD (P
Centre for Plant & Water Science 2008 Annual Report Table 2. Effect of oxygation on yield, various indices of water use efficiency, and soil respiration by pineapple. Treatments Estimated yield (t/ha) 1 Industry yield (t/ha) 2 IWUE (kg/m 3 ) 3 WUE (kg/m 3 ) Soil respiration rate (g CO 2 /m 2 /h) Oxygation 79.6 53.08 44.56 2.549 2.42 Control 68.2 50.92 43.60 2.448 1.18 P value 0.005 0.295 0.569 0.307 0.001 LSD 6.43 4.59 3.906 0.221 0.409 1 : Industry yield refers to only marketable yield, 2 IWUE: Irrigation water use efficiency, 3 WUE: Season long water use efficiency includes rainfall + irrigation PROJECT STAFF Principal Investigator: Co-Principal Investigator: Others: FUNDING Cotton CRC INCOME $2,412 Jay Dhungel Prof David Midmore Dr Surya Bhattarai & Dr Xinming Chen 48
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Centre for Plant & Water Science - Central Queensland University

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